This disk contains the reduced and calibrated images, weight maps and
flag maps, as well as single passband catalogs derived from the image
files, of the XMM-Newton Follow-Up Survey (XSF).
The XFS was carried out by the ESO Imaging Survey (EIS) Team in
collaboration with the XMM-Newton Survey Science Centre and a team from the
Argelander-Institut für Astronomie (AIfA), Bonn.
A private extension
of this survey was conducted jointly by that team at the AIfA and the
AIP, Potsdam. For this extension, the same kind of data are also
provided on this disk. Permission to use these data is granted
provided that the two publications (Dietrich et al. 2006, A&A 449,
837; Dietrich et al. 2007, A&A 470, 821) describing them are cited in
any work making use of these data.
For several fields and filters more than one final coaddition is
available. These correspond to different quality selection criteria
imposed on the frames entering the coaddition process. These
coadditions are identified by a four digit identifier. Its meaning is
described in Dietrich (2006, PhD thesis,
University of Bonn, Germany), where more details
on the data reduction are given.
The selection conditions can also be
found in the FITS headers of the coadded frames in the CONDx headers.
The photometric calibration is provided on a best effort basis
only. Although care was exercised to use only photometric nights for
calibration a clear judgement of the observing conditions was not
always possible. A few difficult cases are discussed in Dietrich et
al. (2006), but the majority of problems can be found in the private
extension data observed in only one or two passbands.
Note that for fields observed in at least three passbands, good relative photometry
between passbands can be achieved by matching the observed stellar
sequence in a color-color diagram to the expected one. This was,
however, not done for the data provided here.
All questions concerning these data should be directed to Joerg Dietrich (jdietric@eso.org).